单项选择题

Some fish have a greater （）for acid water than others.

A．tolerance
B．resistance
C．dependence
D．persistence

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单项选择题

It is true that （）a wild plant into a major food crop such as wheat requires much research time.

A．multiplying
B．breeding
C．magnifying
D．generating

单项选择题

There was once a town in this country where all life seemed to live in （）with its surroundings.

A．coincidence
B．harmony
C．uniform
D．alliance

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